trigonous

Up to 2/3 of the flowers may produce trigonous achenes.

They are lanceolate and trigonous, with a point that is rounded but with a tiny spike.

The stems are trigonous (roughly triangular in cross-section), but with convex, rounded faces.

Weberocereus tonduzii: Stems trigonous, ca. 3 cm wide, spines nearly lacking, minute.

It is obtusely trigonous (triangular in cross-section).

Achenes are variable in shape, sometimes compressed, sometimes trigonous, the two shapes sometimes present on the same plant.

It is terete to obtusely trigonous and varies in diameter from up to 3 mm in rosettes and short stems, to 4-5 mm in climbing stems.

After the iris has flowered, it produces an elliptical or trigonous (having three angles or corners) seed capsule, that is 2-3 cm long, when ripe it is straw coloured.

Unfortunately, populations of Carex hassei sympatric with Carex klamathensis in the Klamath Region often have a mix two- and three-styled flowers that produce viable lenticular and trigonous achenes, respectively.